Willow Creek Watershed Dam B-22 Reservoir Report
Last Updated: December 15, 2025
Willow Creek Watershed Dam B-22, located in Ray County, Missouri, was completed in 1971 by the USDA NRCS and serves as a vital structure for debris control along the TR-WILLOW CR river.
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Summary
The earth dam stands at a height of 33 feet, providing a storage capacity of 124 acre-feet and covering a surface area of 7 acres. Despite its low hazard potential and moderate risk assessment, the dam has not been rated for its condition and lacks an Emergency Action Plan (EAP) as of the last update in May 2021.
Managed by local government authorities, Willow Creek Watershed Dam B-22 is not regulated by the state and does not require permits or inspections. The dam's primary purpose is debris control, with an uncontrolled spillway type and no outlet gates. While the dam does not present immediate risks, its risk management measures, including the development of an EAP and maintenance of updated emergency contacts, are currently lacking. With its strategic location in the Rock Island District and close proximity to the city of Henrietta, the dam plays a crucial role in protecting the surrounding area from potential flooding and debris accumulation.
Year Completed |
1971 |
Dam Height |
33 |
River Or Stream |
TR-WILLOW CR |
Primary Dam Type |
Earth |
Surface Area |
7 |
Drainage Area |
110 |
Nid Storage |
124 |
Structural Height |
33 |
Outlet Gates |
None |
Hazard Potential |
Low |
Foundations |
Unlisted/Unknown |
Nid Height |
33 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Dam Data Reference
Condition Assessment
SatisfactoryNo existing or potential dam safety deficiencies are recognized. Acceptable performance is expected under all loading conditions (static, hydrologic, seismic) in accordance with the minimum applicable state or federal regulatory criteria or tolerable risk guidelines.
Fair
No existing dam safety deficiencies are recognized for normal operating conditions. Rare or extreme hydrologic and/or seismic events may result in a dam safety deficiency. Risk may be in the range to take further action. Note: Rare or extreme event is defined by the regulatory agency based on their minimum
Poor A dam safety deficiency is recognized for normal operating conditions which may realistically occur. Remedial action is necessary. POOR may also be used when uncertainties exist as to critical analysis parameters which identify a potential dam safety deficiency. Investigations and studies are necessary.
Unsatisfactory
A dam safety deficiency is recognized that requires immediate or emergency remedial action for problem resolution.
Not Rated
The dam has not been inspected, is not under state or federal jurisdiction, or has been inspected but, for whatever reason, has not been rated.
Not Available
Dams for which the condition assessment is restricted to approved government users.
Hazard Potential Classification
HighDams assigned the high hazard potential classification are those where failure or mis-operation will probably cause loss of human life.
Significant
Dams assigned the significant hazard potential classification are those dams where failure or mis-operation results in no probable loss of human life but can cause economic loss, environment damage, disruption of lifeline facilities, or impact other concerns. Significant hazard potential classification dams are often located in predominantly rural or agricultural areas but could be in areas with population and significant infrastructure.
Low
Dams assigned the low hazard potential classification are those where failure or mis-operation results in no probable loss of human life and low economic and/or environmental losses. Losses are principally limited to the owner's property.
Undetermined
Dams for which a downstream hazard potential has not been designated or is not provided.
Not Available
Dams for which the downstream hazard potential is restricted to approved government users.
Willow Creek Watershed Dam B-22